ATI Radeon HD 3870 Mac Edition vs NVIDIA GeForce GT 640 Rev. 2

VS

ATI Radeon HD 3870 Mac Edition

NVIDIA GeForce GT 640 Rev. 2

We compared two Desktop platform GPUs: 512MB VRAM Radeon HD 3870 Mac Edition and 1024MB VRAM GeForce GT 640 Rev. 2 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

ATI Radeon HD 3870 Mac Edition 's Advantages

Larger VRAM bandwidth (72.06GB/s vs 40.06GB/s)

NVIDIA GeForce GT 640 Rev. 2 's Advantages

Released 4 years and 11 months late

More VRAM (1024GB vs 512GB)

64 additional rendering cores

Lower TDP (49W vs 106W)

Score

Benchmark

FP32 (float)

Radeon HD 3870 Mac Edition

0.497 TFLOPS

GeForce GT 640 Rev. 2 +61%

0.803 TFLOPS

Radeon HD 3870 Mac Edition

VS

GeForce GT 640 Rev. 2

Graphics Card

Jun 2008

Release Date

May 2013

Radeon R600

Generation

GeForce 600

Desktop

Type

Desktop

PCIe 2.0 x16

Bus Interface

PCIe 2.0 x8

Clock Speeds

-

1126 MHz

Memory Clock

1252 MHz

Memory

512MB

Memory Size

1024MB

GDDR4

Memory Type

GDDR5

256bit

Memory Bus

64bit

72.06GB/s

Bandwidth

40.06GB/s

Render Config

4

Compute Units

-

320

Shading Units

384

16

TMUs

32

16

ROPs

8

-

L1 Cache

16 KB (per SMX)

256 KB

L2 Cache

512 KB

-

Theoretical Performance

12.43 GPixel/s

Pixel Rate

8.368 GPixel/s

12.43 GTexel/s

Texture Rate

33.47 GTexel/s

-

497.3 GFLOPS

FP32 (float)

803.3 GFLOPS

99.46 GFLOPS

FP64 (double)

33.47 GFLOPS

Board Design

106W

TDP

49W

300 W

Suggested PSU

200 W

2x DVI 1x S-Video

Outputs

1x DVI 1x HDMI 1.4a 1x VGA

1x 6-pin

Power Connectors

None

Graphics Processor

RV670

GPU Name

GK208

RV670 XT (215-0708005)

GPU Variant

GK208-400-A1

TeraScale

Architecture

Kepler 2.0

TSMC

Foundry

TSMC

55 nm

Process Size

28 nm

0.666 billion

Transistors

1.02 billion

192 mm²

Die Size

87 mm²

Graphics Features

10.1 (10_1)

DirectX

12 (11_0)

3.3 (full) 4.0 (partial)

OpenGL

4.6

N/A

OpenCL

3.0

N/A

Vulkan

1.1

-

CUDA

3.5

4.1

Shader Model

5.1

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